What is the difference between LRD** and LR3D** relays?

Published date:
11 September 2018

LR3D** relays are used for the unbalanced loads : there can be different currents in the three phases of the overload relay ( according to its size ) . examples : distribution circuits which have not the same loads on each phases, or single phase motor. This relay will not trip if the currents in its phases are different.
The LRD** which is for balanced load : that means with the same current on the three phases ( e.g. a squirrel cage motor ).
This is the only difference between LRD & LR3D relay.

Was this helpful?

Yes

No

83 % found this helpful

What can we do to improve the information ?

Can't find what you are looking for?

Reach out to our customer care team to receive information on technical support, assistance for complaints and more.